LinuxQuestions.org - "GREP_COLORS=" cannot work so long as preceded by sudo

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- - "GREP_COLORS=" cannot work so long as preceded by sudo (https://www.linuxquestions.org/questions/manjaro-119/grep_colors%3D-cannot-work-so-long-as-preceded-by-sudo-4175701780/)

"GREP_COLORS=" cannot work so long as preceded by sudo

Why "GREP_COLORS=" set cannot work if grep family, i.e. more actually pcre2grep, preceded by sudo ?

though fact is other Linux, i.e. MX, simply go working
please help out to work here too

Most probably, you have defined an alias somewhere in your shell startup files for regular user. Something along the lines

Code:

alias pcre2grep='pcre2grep --color=auto'

This alias is not defined for root. Compare the output of

Code:

alias

and

Code:

sudo alias

Same goes for the environment variable GREP_COLORS. By default, sudo sanitizes most of the environment. GREP_COLORS set for the regular user won't be seen by root unless included in the env_keep list.

This is actually the case where cat abuse otherwise known as UUOC might make sense:

Code:

sudo cat file_accessible_only_by_root|pcre2grep RE

Or just specify the --color option explicitly (this will use default colors though):

Code:

sudo pcre2grep --color RE file_accessible_only_by_root

EXCELLENT
Thanks, more importantly must God reward you..